From left: Red Valentino Lace Trimmed Dress $790 @ Net-A-Porter, Erin Fetherston Cap Sleeve Dress $995 @ Shopbop, Sonia by Sonia Rykiel Sequin Dress $580 @ Net-A-Porter

You don't have to be the boy who never grows up to enjoy this trend; in fact, this style is for girls of all ages. While the collar keeps you covered, the addition of a cap sleeve, a sheer neckline, or some sultry sequins adds a hint of sexiness. Try the trend in black with these pieces.